Edge-burnishing machine.



Patented 'Oct. 8, 1918.

2 SHEETSSHEET I //VV/V7Z7R P. R. GLASS.

EDGE BURNISHING MACHINE.

APPLICATION FILED JAN-13.1916.

1520,7101 Patented (m. 8, 1918.

2 SHEETSSHEET 2.

backward movements.

PERLEY R." eLAss,or BROOKLINE, MASSACHUSETTS, ASSIGNOR, BY EsNEA'ssIGn MENTS, TOUNITED SHOE MACHINERY ooRPoa 'rIoN, or PATERSON, NEW JERSEY;

A CORPORATION OF NEW JERSEY;

' EDGE-BURNISHING MACHINE.

Specification of Letters Patent. A -ate11ted- Oct, 8', 1918.

A Application filed January 13, 1916. S eria11 {o. 7i ,9o2.

To all whom it may concern: A

Be it known that I,-PERLEY R. GLAss, a citizen of the United States, residing" at Brookline,-,in the county of Norfolk and State of Massachusetts, haveinvented certain Improvements in Edge-Burnishing Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the severalfigures- This invention relates to leather working machines andis herein illustrated 'in connection with a machine for burnishing the edges of pieces of upper leather.

It is customary fwith some grades of leather to finish the edges by burnishing them and thereby to avoid the more expensive process of Askiving and .folding said edges.

A feature of the present invention comprises a tool for operating upon the stock, and means for feedin the stock. forward and back intermittent y in operative relation to said tool, the extent of the forward movements being greater than that of the In the illustrative machine a burnishing tool is caused to oscillate in contact with the edge of a piece of leather fed in the manner described above, the oscillationsof the tool with res ect' to the feed being so timed that the rubbing aotion of the tool at any given instant takes place in a direction counter t of feed at that instant. I A

This and other features of'the invention including certain details of construction and combinations of parts willrbe described in connection with an.illustrati've machine. and pointed out in the appendedjclaims.

Referring now to the accompanying drawings A a Figure 1 is'an elevation ofa machinein o the direction which the present invention, is embodied;

Fig.2is a section onthe line 2-2 of Fig. 1, certain parts of the frame having been piece of stock in the process of having its edge burnished. A

Before going into the details of construction the general modeof operation of the machine as best illustratedin Fig. 3, will be described. {The burnishing'tool 1, which is oscillated in the manner 'indicatedby the arrows, is provided with a groove 101 to receivethe edge of the stockfll'OO, said stock being held down upon afeed roll 3 by a H S A ESPAT wrwE-P spring-pressed disk 5; and to the feed roll V is imparted an unequal oscillation, that in the forward direction being ofgreater extent than that in the rearward direction as indicated by the arrows; The timing of the respective oscillations of the burni'shing tool andfeed roll is such that theoperative portion of said tool is always moving in a direction counter to that of the stock, the actionof the tool upon the stock during the rearward movement of said stock being consequently exerted uponfa less" extent of the edge 'of said stock than is its action upon the forwardly moving stockf The result of this procedure is to approximate the effect producedby manual-'burnishingin that the edge of the stockis rubbed first in one direction and then in the other. v f 1 Thedisk 5 is mounted in a casing 7 having a slottedear 9 throughv which passes'the stem of a; set screw-11 for, holding said easing, and with it said dislgiiin adjusted horizontal and angular position. A coiledspring 13, the tension of whichi 'may be'varied by turning the thumb screw 15, holds the/disk down upon the stock, suitable ball bearings being provided to take respectively the end thrust and the lateral thrustof'the stem of said disk. 3

- The burnishing AtoolA l isfa'stened by a clamp 17A-to'a holder'19 which is splined to an upright shaft 21. Agr0ove formed in the holder l9 receives the arms and ,base of a yoke 23 between the arms of which is fastened ablock 25 having,rotatably-rn'ounted therein a screw threadedstem 27,. A'collar' 29lthrea'de'don saidstem and held between two. ears onthe frame of the machine furnishes'means for raising and lowering saidstem and with it the burnishing tool l. A

coiled spring .3 1 locatedbetween' a collar onthe shaft 21 and the top of the toolholder 19 prevents chattering of the parts. The shaft {21 has formed upon it ascr'ew 33 "of steep pitch with which a nut 35 cooperates,

said nut having a slotted extension to receive a crank-pin 37 0113. disk which is fast to the driving shaft 39; AATWosuitable ball- 1 bearings 41, 43 receivethe upward and downward thrust of the shaft gL rithpthe H construction described above rotationof the shaft 39produces oscillation of the shaft 21 and consequently-of the burnishing'tool 1.

The feed roll 3 is mounted upon a horizontal shaft 15 which carries fast to its inner end a gear 47 said gear being driven first than the extent of the counter-clockwise movement so that the stock is advanced stepbyf-step past the burnishing tool. 7

Thescrew 49 is formed upon a rod 51, the lower "end" of said rod passing througha collar 53jpivoted at '55 toa rod 57 which may be adjusted to bring the'worm4l9 into proper mesh with the gear 47 andithen locked jin adjusted position by manipulatingthenuts 57. The upper end of the rod 51 is slidably connected with'but held from rotation with respectto, an upright spindle 59jsaid' spindle having bearings in a carrier i61 fwhi'ch is loosely hun'gon the drivingshaft '39 and having fast to it near it's iipp'erfend a gear 63 which meshes with a gear 65fo'nthe driving shaft 139. \Vhen, therefore; the'shaft 39 is'rota'ted tl'ie'worm 49is rotatedbutis free tolreciprocate vertically. v

@Beciprocation of the stem 51is accomplis'hed by the following mechanism. Fast to'the stem 51 are two collars 67; and between said collars and separated from them ball bearings is a loose collar 69 to which is pivoted 'at71 one'end of'a link73to the strap??? which'encircles an eccentric on the shaft39 "A"fulcrum block 79 adjustably held in a slot in the link 73 by aiScre'wf81 ispivoted to the lower end of a link'83 the up'per end 'of which is pivoted 'at 85 to the frame ofjthe machine. {In order to adji st th link8 3"angularlyafid to hold it inadtjiiste d position a 'lin k 87 is pivoted at o'ne end at'89 to the link 83 and at'the otherend 'at 91 to a's'c'r'ew threaded rod 93 which jl'lily be moved-longitudinally by turning a thumb-nut 95Tandinay belocked by means 'o fia wingnut 97. I The operation of the feed mechanism which has been described above is as follows Rotation of the shaft 39' through the ge'ars63 and 65' arijclthe spindle 59 causes rotation of the-worm 49 and consequently of the feedroll' shaft a5 in a counter-clockwise direction as viewed in Fig. ,2. In" advance the stock.

dition to this rotation of the worm 49 there is imparted to it, through the rod 75 and link 73, a complete vertical reciprocation ateach revolution of the shaft 39. The worm 49 thus has two functions one to operate as a ;worm proper and the other to operate as a rack on the gear or pinion 47. Down- Iward movement of the worm accelerates the counter-clockwise rotation of the gear 47 and up'war'd'movement of the worm reverses the direction of rotation of said gear. Consequently the stock is fed reward and b ack by a "series of intermittent inove1n'ents (if which the forward movements are of gfireater e'f itent than that of the rearward movements "so that the'final result is to ad- An adjustable edge gage '99 isprovided to facilitate guiding thestoc'k properly to the tool. I i 1 Although the invention has been set forth in connection with a particular machine, it should be understood that the invention is not limited in the scope of its a 'iplic'ation to the particular machine shown and tle- "scribed. I I I clainra's new and desire to secure byLetters Patent:

" 1'. amass of the class "describedjhaw "ing, incombi'i'ifationfa tool for "operating upon a piece of stock, and means for feed- 'ing the "stock forward and back intermit- 'tentlyhroperative relation to said tool; the

extent of "the "forward 'movementsfbeing greater than that of "the i bacl'zward "move ments. v v I I I 2. A machine of the class described; havin'g, in combinatlon, a blfiil'illlhg tool, and

back intermittentl with its edge in"en;ga'gement withfs'afd r061, the es-mentor theforward" inovengiei'its being "greater than that 5 of t'he b'ackward movements.

other end of which is pivoted a connecting- 'rod'75 having at its upper end al eccentric '1 in combination, a burnishin'g tool; means for oscillating said toolgfalnd jineansfor'feedthe stock forward and back intermitward movements,

4 a m-amass the class; described; havv g, in combination, means for "feeding'a u n "WW1 Y pleceof stock forward and back intermitten t-ly, the "extent 'of the forward movements being greaterthan that of the backward "movements, and'i'ri'eans for rilbbing the edge of the stock in a direction counter to the A "K r i d rection of movement of said stock-atany "k'ziven m'stant of the'iubb'ing operation.

machine ofthe class 'described," hav- 111g, 1n combination, a burnishimz tool. a roll for feed ngstock past [said tool, and

ine'ans forioscillatin g said feed rdllffoi-ward and back, the extent of; the forwai d oscilla- "means for feeding the stock fofwa'rd "and p I01 I01 -operat'1ng 2d roll to advance :ar for operating rotating and ress described, hav

v01 for operating ad roll to advance m for operating g and reciprocatfor varying the ,r 7717-280 710 SLOCK, 311(1 means I01 OSOIUaUIIIg 831(1 i001- 1 1. In a burnishing machine, a burnishlng tool, a feed mechanism, and means for synchronously moving the feed mechanism and the burnishing tool forward and backward, the feeding movement being at all times opposite in direction to the burnish- I ing movement.

In testimony whereof I have signed my name to this specification.

PEBLEY R. GLASS.

btained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

upon a piece of stock, a fer the stock, a Worm and ge said roll, and means for ciprocating'said Worm.

8. A machine of the cla: ing, in combination, a tc upon a piece of stock, a fee the stock, a Worm and ge said r011, means for rotatin ing said worm, and mean: extent of said reciprocation Copies of this patent may be 0 

